diff --git a/changelog.d/20240130_123351_regis_fix_save_on_plugins.md b/changelog.d/20240130_123351_regis_fix_save_on_plugins.md
new file mode 100644
index 0000000..164dd81
--- /dev/null
+++ b/changelog.d/20240130_123351_regis_fix_save_on_plugins.md
@@ -0,0 +1,2 @@
+- [Bugfix] Actually update the environment on `tutor plugins enable ...`. (by @regisb)
+- [Feature] Introduce a `tutor.hooks.lru_cache` decorator that is automatically cleared whenever a plugin is loaded or unloaded. This is useful, in particular when a plugin implements a costly function that depends on tutor hooks. (by @regisb)
diff --git a/tests/test_plugins.py b/tests/test_plugins.py
new file mode 100644
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--- /dev/null
+++ b/tests/test_plugins.py
@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+from tests.helpers import PluginsTestCase
+from tutor import hooks, plugins
+
+
+class PluginsTests(PluginsTestCase):
+    def test_env_patches_updated_on_new_plugin(self) -> None:
+        self.assertEqual([], list(plugins.iter_patches("mypatch")))
+
+        hooks.Filters.ENV_PATCHES.add_item(("mypatch", "hello!"))
+
+        # env patches cache should be cleared on new plugin
+        hooks.Actions.PLUGIN_LOADED.do("dummyplugin")
+
+        self.assertEqual(["hello!"], list(plugins.iter_patches("mypatch")))